The First 15 Minutes of Lord Monarch: 新・ガイア王国記 (PlayStation)

Copied from PlayStation DataCenter:

Lord Monarch is a strategy war game by Nihon Falcom. It is the seventh installment in the Dragon Slayer series. It was originally released in 1991 for the NEC PC-9801, ported 1992 to the Super Famicom and 1994 to the Sega Mega Drive. 1997 it was remade for Windows as Lord Monarch Online and released for free.

You are prince Alfred, the son of the great king of Monarch. Since you have been a rather fresh and lazy boy, the king decides to strengthen you by sending you to battle. You are now sixteen, and you must prove you are worthy of being the prince of Monarch!

This is a strategy war game. You command an army and can perform various actions, such as sending troops, fortifying your position, allying with another ruler, etc. There are time limits to your strategic operations during which you'll have to defeat the enemy.